PortA.2 on a 16F676

[Acetronics2]

Hi,

A look at the datasheet shows A.2 is a schmitt trigger input ... not so good for such measurements.
Measurement differences with other ports come from here ...

The only way to keep your board as-is would be to raise the voltage from your trafo ... the trigger levels occur on the "very low" ( read closest to zero crossing) part of the sine.

no real hope of saving your board ...

Alain

[ardhuru]

Hi,

A look at the datasheet shows A.2 is a schmitt trigger input ... not so good for such measurements.
Measurement differences with other ports come from here ...

Alain

oh, missed that.

Thank you so much; fortunately I do have a spare pin I could use.

I still dont understand why the pulsin should not be 10ms (50 Hz, positive half cycle) or *less*, rather than the roughly 17 ms that I'm getting?

Regards,

Anand

[Acetronics2]

Just look at your sine w/the scope ...

some surprises guaranteed !!!

Alain